that the capacity listed on the APR is the modulation capacity not the system capacity. 100% modulation is NEVER acceptable. Example: a 3.5 ton system cannot use the APR-410-3 (3.5 tons... gives 1.5 tons of modulation on an R-410A system. Please note that the capacity listed on the APR is the modulation capacity not the system capacity. 100% modulation is NEVER... of modulation that change the velocity of the suction gas have this concern. We insure this is not an issue by maintaining a minimum velocity up the risers. How are the APR Controls...

, but the installer must confirm that suction pressure will fall far enough to cause the APR Control to begin to modulate the system capacity. If load does not fall enough, the APR... by refrigerant and the maximum amount of modulation. Thus an APR-410-1 gives 1.5 tons of modulation on an R-410A system. Please note that the capacity listed on the APR is the modulation... capacity not the system capacity. 100% modulation is NEVER acceptable. Example: a 3.5 ton system cannot use the APR-410-3 (3.5 tons of modulation). What is the meaning of the model...

valve connected to a thermostat for independent operation. The patented APR-1.4 control by Rawal Devices was used to provide as much as 4 tons of capacity modulation to the nominal 5...-ton refrigeration circuit. Capacity modulation permits the system to match changing load conditions in the two zones by responding to changes in temperature and pressure...

to help reduce system capacity and extend runtimes, but the installer must confirm that suction pressure will fall far enough to cause the APR Control to begin to modulate the system... will maintain suction pressure by modulating refrigerant flow reducing capacity at the evaporator. Proper and regular equipment maintenance will eliminate this problem. The air..., the APR Control will modulate the capacity of the system to match the changing load. By responding to changes in suction pressure, the APR will reduce system capacity as load...

with the APR Control A system that has the ability to modulate capacity also can provide better reliability and fewer operating problems. These often are related to stresses placed upon... improper or inadequate maintenance), insufficient heat load, or improper use of system controls (thermostats). The ability of the APR Control to modulate a systems capacity... and warranty issues, even on new systems. Excessive compressor cycling This results from too much system capacity, oversized for the load, and leads to stress on the compressor from...